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std::binder2nd

STD：：binder 1，std：：binder 2

template< class Fn > class binder1st : public std::unary_function { protected: Fn op; typename Fn::first_argument_type value; public: binder1st(const Fn& fn, const typename Fn::first_argument_type& value typename Fn::result_type operator()(const typename Fn::second_argument_type& x) const; typename Fn::result_type operator()(typename Fn::second_argument_type& x) const; };(1)(until C++17)(deprecated since C++11)
template< class Fn > class binder2nd : public unary_function<typename Fn::first_argument_type, typename Fn::result_type> { protected: Fn op; typename Fn::second_argument_type value; public: binder2nd(const Fn& fn, const typename Fn::second_argument_type& value typename Fn::result_type operator()(const typename Fn::first_argument_type& x) const; typename Fn::result_type operator()(typename Fn::first_argument_type& x) const; };(2)(until C++17)(deprecated since C++11)

将参数绑定到二进制函数的函数对象。

参数的值在构造时传递给对象，并存储在对象中。但是，每当函数对象被调用时，operator()，存储的值作为参数之一传递，另一个参数作为operator()得到的函数对象是一元函数。

1%29将第一个参数绑定到值。value在物体的构造中给出的。

2%29将第二个参数绑定到值。value在物体的构造中给出的。

另见

bind1stbind2nd (until C++17)(until C++17)binds one argument to a binary function (function template)

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